.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

.button1 {background-color: #008CBA;} /* Blue */
.button2 {background-color: #f44336;} /* Red */ 
.button3 {background-color: #e7e7e7; color: black;} /* Gray */ 
.button4 {background-color: #555555;} /* Black */
.button5 {background-color: #ff9900;}
.button6 {background-color: #33cc99;}